#include"mystdio.h"
#include<sys/types.h>
#include<sys/stat.h>
#include<string.h>
#include<fcntl.h>
#include<stdlib.h>
#include<unistd.h>

static MyFile * BuyFile(int fd,int flag){
    MyFile* f = (MyFile*)malloc(sizeof(MyFile));
    if(f == NULL) return NULL;
    f->bufferlen = 0;
    f->fileno = fd;
    f->flag = flag;
    f->flush_method = LINE_FLUSH;
    memset(f->outbuffer,0,sizeof(f->outbuffer));

    return f;
}

MyFile* MyFopen(const char* path,const char* mode){
    int fd = -1;
    int flag = 0;
    if(strcmp(mode,"w") == 0){
        flag = O_CREAT | O_WRONLY | O_TRUNC;
        fd = open(path,flag,0666);
    }
    else if(strcmp(mode,"a") == 0){
        flag = O_CREAT | O_WRONLY | O_APPEND;
        fd = open(path,flag,0666);
    }
    else if(strcmp(mode,"r") == 0){
        flag = O_RDWR;
        fd = open(path,flag);
    }
    else{

    }
    if(fd < 0) return NULL;

    return BuyFile(fd,flag);
}
void MyFclose(MyFile* file){
    if(file->fileno < 0) return;
    MyFFlush(file);
    close(file->fileno);
    free(file);
}
int MyFwrite(MyFile* file,const void* str,int len){
    memcpy(file->outbuffer+file->bufferlen,str,len);
    file->bufferlen += len;
    if((file->flush_method & LINE_FLUSH) && file->outbuffer[file->bufferlen - 1] == '\n'){
        MyFFlush(file);
    }
    return 0;
}
void MyFFlush(MyFile* file){
    if(file->bufferlen <= 0) return;
    int n = write(file->fileno,file->outbuffer,file->bufferlen);
    (void)n;
    file->bufferlen = 0;
}
